Pulverizer.



P. C. FORRESTER PULVERIZER APPLICATION FILED SEPT.29,

Patented June 8, 1915.

2 SHEETS-SHEET I.

T I I I ll P; c. FORRESTER.

PULVERlZER.

'APPLICATION FILED SEPT.29, 1913.

Patented June 8, 1915.

are sra'rss PETER C. FORRESTER; OF WEST TACOMA, WASHING-TON.

. PULVERIZEB.

-. Specification of Letters Patent.

Application filed September 29, 1913. Serial No. 792,277.

, To all whomit may concern Be it known that'I, PETER C. FORRESTER, a citizen of the United States, residing at West Tacoma, in the county of Pierce and State of Washington, have invented a certain new and useful Improvement in Pulverizers, of which the followingis a specification.

'My invention relates to improvements in pulverizing machines and is illustrated in one form in the accompanying drawings, wherein.- f. Figural is an end elevation; Fig. 2 is a transverse section; Fig. 3 is. a section along the line 3-3 of Fig. 1.-

Like'parts are indicated by like letters throughout the several figures.

A A is a supporting frame containing bearings A, A arranged on opposed ends thereof. 7 .A- 1 a shaft supporting said bearings A A andinclined at an angle to the horizontal. I

A, A A arespiders rigidly attached to the shaft A A is acylindrical casing surrounding said spiders and shaft and A A are head plates closingsaid casing. The spiders A, A A are provided with tapertures or orifices-13, 155 and B arranged in annular groups about the shaft and de, crease indiameter outwardly. These are partly filled with metallic bars, steel rails, shaftings and the like as indicated at B These barmembcrs are the crushing memated by the drum A".

Cls a feed hopper the feed conveyor G 1-- bers and are held against longitudinal displacement by the head plates A A; Screens B, B are interposed between the gronpsof apertures B, 13 B to limit the size of the product as it passes through.

A, A are discharge ports in the pe- 'riphery of the drum A adjacent the head plate A and discharging into the shute A.

C is a feed opehing'concentricj'with the shaft A at the upper end of the drum.

Into it discharges the feed chute C fed bythe screw 'conveyer C which is intermittently. driven by the member operw hieh discharges into I Y C is a pulley onthe end of the shaft A whereby the shaft and crushing machine may be rotated by any suitable'meansf fromi source.

D is a platform supported on the frame the finest crushing takes place.

A whereby access may be conveniently had to the filling hopper. C"; Y

E, E are spacing blocks interposed between the frame A and bearings A A whereby the position of these hearings may be changed to vary the inclination of the shaft thereby controlling the rapidity for filling the mill.

It will be evident that I have shown in drawings an operative device, still many changes might be made both in size, shape and arrangement of parts -without departing from the spirit of my invention, and I wish, therefore, that my drawings {be regarded as in a sense diagrammatic- When itis desired to dispense with the driving pulley onv the drum. shaft a belt K is placed about the drum itself and drives it from any suitable source of power.

G, G are wings or vanes interposed between the packages or bundles of crushing rods and adapted to pick up the material from the lower sides of the crushing zones Patented June 8, 1915.

and carry it around to the upper side from v whence it may be discharged by gravity -down upon the crushing bundles.

- The use andoper'ation of my invention is as follows: The mill is rotated by any suitable power. The crushing members which .are segregated into groups or zonesv are kept at the same position. The material to be crushed is fed into the hopper and thence passes to the screw conveyer which operates at a fixed speed relation. The material is thereby fed into the center of the drum at the upper end and drops down oh it. and

passes between the crushing bars. As they roll over and over they 'comeinto violent contact with one another, thematerial is pulverized finally dropping on to the screen. 'As the screen rotates, this material will be carried up'and the material again dropped onto the crushing bars. As this process continues, the material will become finer and finer and pass down'toward the drum. That material which; is sufliciently fine will pass through the'scleen to the next crushing zone, where since the rods are finer and greater in number, the material will be still more finely, crushed. It'- will subsequently pass to the outside zone where By this time the material will have passed down to the drum where it can pass out through any suitable port. In the smaller mills but one zone is used, there being no screens, and the fineness of the pulverized material is regulated by the feed and theinclination of the mill. 1

I have shown the drum inclined to the horizontal in order to assist in thefeeding process. It is obvious, of course, that this is not essential but that the drum would feed itself even though not inclined.

I claim:

1..In a crushing machine a plurality of groups of crushing members, said groups of crushing members being arranged annu-,

larly about a common axis of rotation and fixed with respect one to another, the mem- 1 bers in said groups being free to move with respect one to another but constantly assembled en masse and means for rotating said groups in unison about said common axis and means for introducing material to b crushed to said groups atone end there f adjacent the axis of rotation.

2. A crushing machine comprising a shaft and means for rotating it, spiders rigidly attached thereto and having apertures in register, a drum inclosing said spiders and provided with head plates closing the ends ,tainedin said spider apertures and loosely abutting at either end on the head plates,

1 the apertures in said spiders being arranged thereof, said drum having' an opening in each of its ends, crushing bars loosely contained in said spider apertures and loosely abutting at either end on the head plates.

3. A crushin'gmachine comprising a shaft .and means for rotating it,.spider's rigidly attached thereto and'having apertures in register, a drum inclosingsaid spiders and provided with head plates closing the ends thereof} said drum having an opening in each of its ends, crushing bars loosely contained in said spider apertures and-loosely abutting at either, end on the head plates, the apertures in said spiders being arranged in concentric zones.

4. A crushing machine comprising a shaft and means for rotating it, spiders rigidly attached thereto and having apertures in register, a drum inclosing saidspiders' and provided with head plates closing the ends thereofQsaid drum having an opening. in each of its ends, crushing bars loosely conin concentrlc zones, and the apertures in the inner zone being larger than and less numerous than in the outer zone.

5. A crushing machine comprising a shaft and means for rotating it, spiders rigidly attached thereto and having apertures in I register, a drum inclosing said spiders. and

. the apertures in said spiders being arranged in concentric zones, and the crushing bars in the smallerapertures being smaller than those in the larger apertures.

6. Acrushing machine comprising a shaftandmeans for rotating it, spider s rigidly attached thereto and apertures in' register, a drum inclosing said spiders and provided with head plates closing the ends thereof,

said drum having an .opening in each ofitsends, crushing bars loosely contained in said spider apertures and loosely abutting at either end on the head plates, the apertures in said spiders being arranged in con- 1 cen ric zones, and the apertures in the inner zone belng larger than and less numerous than in the outer zone, the .crush' ing bars in the smaller -a pertures being smaller than those in the larger apertures.

7. In a crushing machine a'plurality ofseparate groups of crushing members ar ranged in separate concentrlc crushing zones,

means for rotating said groups of crushing members in unison about a central axis,-the groups being fixed in position with respect each to the other, .the crushing members in each group being free to move'with respect one to another but constantly assembled en separate groups of crushing members for conveying the material from the upper to the lower side of the crushing zones.

'masse, and means interposed between the 8. A crushing machine comprising a hollow crushing drum, a series of separate groups of crushing bars extending substantially the length of the drum, said bars held in close groups whose cross sectional areaon a'pla'ne perpendicular to the axis of the drum is but slightly larger than the total cross sectional area of the individual bars, said groups being held in fixed relation with respect each to the drum, means for rotating the drum and means for feeding material to be crushed thereto and discharging it into said groups and means for discharging said material to the drum.

In testimony whereof, I" affix my signature in the presence of two witnesses this eighth day of September 1913. A

PETERC. FORRESTER. Witn'esses:

' WM. A. ODONNELL,

Lucia R. ODoNNELL. 

